401(k) · DOL Form 5500 · 2022
Board of Trustees of Supplemental Income Trust Fund 401(k) Plan
Data updated 2026-08-11
- $1.4B
- Total assets
- 28,894
- Participants
- 99th
- Percentile by assets
- $49,220
- Avg per participant
Official DOL plan name: Supplemental Income 401(k) Plan · Sponsored by Board of Trustees of Supplemental Income Trust Fund · California · Transportation & Warehousing
$1.4B in assets, 28,894 participants
Board of Trustees of Supplemental Income Trust Fund's Supplemental Income 401(k) Plan reported $1.4B in total assets and 28,894 participants in its 2022 DOL Form 5500 filing, ranking in the 99th percentile by assets among filed plans. Figures are as reported by the plan sponsor to the Department of Labor, not audited or endorsed by PlainRetire.
- 99th percentile by assets (of 139,126 plans)
- #3,823 in Transportation & Warehousing (3,876 peers)
Coverage in California
Supplemental Income 401(k) Plan covers 28,894 participants in California, 46x the typical California plan (state average ~630 per filing). Assets: $1.4B.
- $1.4B
- total plan assets (2022 EOY)
- 28,894
- covered participants
- 99th
- percentile by assets (of 139,126 plans)
- $49,220
- avg assets per participant
The plan reported a net loss of $249M for the year, a single-year figure driven by markets and benefit payments, not a measure of plan health.
Participants vs California filers
In California, the average filing covers about 630 participants across 15,291 plans. Supplemental Income 401(k) Plan reports 28,894 participants - 46x that state average ($1.4B EOY assets).
California filing particulars
| Total Assets (Beginning of Year) | $1.7B |
|---|---|
| Net Assets (End of Year) | $1.4B |
| Net Income | -$249M |
| Employer EIN | 942554388 |
| Plan Effective Date | 1995-01-01 |
| Filing Status | FILING RECEIVED |
Sponsor Plan History (Board of Trustees of Supplemental Income Trust Fund)
| Year | Plans | Participants | Total Assets |
|---|---|---|---|
| 2022 | 1 | 28,894 | $1.4B |
| 2023 | 1 | 30,285 | $1.7B |
| 2024 | 1 | 32,778 | $1.9B |
Nearby 401(k) Plans in California
Peer 401(k) plans, same state, same plan type, ranked by total assets.
Supplemental Income 401(k) Plan vs. nearby 401(k) plans in California, assets vs. participants
- Wells Fargo & Company 401(k) Plan $45.8B · 205,865
- Google LLC 401(k) Savings Plan $28.9B · 102,963
- Oracle Corporation 401(k) Savings and Investment Plan $21.9B · 46,320
- Chevron Employee Savings Investment Plan $18.6B · 19,946
- Intel 401(k) Savings Plan $18.4B · 54,672
Scale composition for Supplemental Income 401(k) Plan
Supplemental Income 401(k) Plan reports $1.4B in end-of-year assets across 28,894 participants (0.012% of the $12.3T held by all Form 5500 filers in the national rollup , and 0.031% of 93,925,755 covered participants) - about $49,220 per participant (36% of the national average assets-per-participant) . Net income for plan year 2022 was -$249M.
This plan identity (EIN 942554388, plan #002) has 3 Form 5500 filings on file from 2022 to 2024 , with end-of-year assets moving from $1.4B to $1.9B (+31.2%) while covered participants moved from 28,894 to 32,778 . Single-year sparse filers cannot show that trail.
| Plan year | Participants | EOY assets | Filing |
|---|---|---|---|
| 2022 | 28,894 | $1.4B | This page |
| 2023 | 30,285 | $1.7B | Open filing |
| 2024 · index core | 32,778 | $1.9B | Open filing |
The same sponsor also keeps 1 other index-core plan on PlainRetire:
- Supplemental Income 401(k) Plan (401(k), $1.9B, 32,778 participants)
Similar-Sized 401(k) Plans Nationally
401(k) plans in other states closest to Supplemental Income 401(k) Plan by total assets, not by location.
- General Dynamics Corporation 401(k) Plan 3.0 (VA) $1.4B · 1,886
- Sidley Austin LLP Savings and Investment Plan (IL) $1.4B · 3,100
- Wesco Distribution, Inc. Retirement Savings Plan (PA) $1.4B · 6,235
- Profit Participation Plan of Moody's Corporation (NY) $1.4B · 4,723
Frequently Asked Questions
How did Supplemental Income 401(k) Plan assets move in 2022? ▼
How have Board of Trustees of Supplemental Income Trust Fund plan assets changed over time? ▼
Where does Supplemental Income 401(k) Plan rank by assets among Form 5500 filers? ▼
Which 401(k) plans are similar in size to Supplemental Income 401(k) Plan? ▼
Next read for Supplemental Income 401(k) Plan
Filing takeaways
Ways to act on Supplemental Income 401(k) Plan's numbers.
- By total assets, Supplemental Income 401(k) Plan ranks among the largest 1% of all filed plans. See the largest plans
- Compare it side-by-side against 3 similar 401(k) plans in California. Compare plans
- Board of Trustees of Supplemental Income Trust Fund's sponsor-wide assets have grown 31.2% since 2022 across 3 plan years on file. More Transportation & Warehousing plans